Upgrading firmware on 3GS

Hi
I currently have an iPhone 3GS unlocked on fw 3.1.3. My question is will I be able to upgrade to 4.0 by doing a shift-restore in iTunes or will I be forced to upgrade to 4.2.1? Reason I want to upgrade to 4.0 is because i want to be able to unlock. Thanks!

Hi
I currently have an iPhone 3GS unlocked on fw 3.1.3. My question is will I be able to upgrade to 4.0 by doing a shift-restore in iTunes or will I be forced to upgrade to 4.2.1? Reason I want to upgrade to 4.0 is because i want to be able to unlock. Thanks!

Click to expand...

If you have the SHSH files saved for 4.0/4.0.1/4.0.2 you can upgrade in iTunes. If you don't your only option is to go to 4.2.1

You can use PwnageTool to upgrade and preserve your baseband. You can even go to 4.1 if you those shsh files saved (but you have to use Pwnage).

Has pwntool been updated to do this on windows yet? I'm looking to do the same thing. Want to go to 4.2.1 but keep baseband. Isn't there a baseband check I read about, does pwntool get you around that?

iPhone3Gs, iOS 4.0.2, modem 5.13.04, OLD bootrom*
SHSH saved for 4.2b3 and 4.2.1 but nothing lower, this worries me a little. I don't even want to jailbreak in fear of hosing the phone and being forced to do an upgrade and lose the possibility of unlock.

Has pwntool been updated to do this on windows yet? I'm looking to do the same thing. Want to go to 4.2.1 but keep baseband. Isn't there a baseband check I read about, does pwntool get you around that?

iPhone3Gs, iOS 4.0.2, modem 5.13.04, OLD bootrom*
SHSH saved for 4.2b3 and 4.2.1 but nothing lower, this worries me a little. I don't even want to jailbreak in fear of hosing the phone and being forced to do an upgrade and lose the possibility of unlock.

Click to expand...

No. PwnageTool is a Mac only software. If any of your friends or family has a Mac you can then use PwnageTool.

Hi, I'm new here and decided to continue this thread instead of starting new one since it is so similar. I have the same, iphone 3gs old bootrom jailbroken on 3.1.3, hacktivated and unlocked 5.12.01 baseband. Have SHSH from 3.1 to 4.1. Also seeking upgrade path to latest jailbroken firmware possible (4.2.1 or 4.1) that is hacktivated/jailbroken/unlocked. As I had a nightmare of trial/error to get 3.1.3 hacktivated and unlocked without the original sim, I had put off until now.

How do I upgrade while preserving baseband on Windows? I do not see any indication that any of these methods will hacktivate the iphone, so do not want any shocks done by assumptions.

Hi, I'm new here and decided to continue this thread instead of starting new one since it is so similar. I have the same, iphone 3gs old bootrom jailbroken on 3.1.3, hacktivated and unlocked 5.12.01 baseband. Have SHSH from 3.1 to 4.1. Also seeking upgrade path to latest jailbroken firmware possible (4.2.1 or 4.1) that is hacktivated/jailbroken/unlocked. As I had a nightmare of trial/error to get 3.1.3 hacktivated and unlocked without the original sim, I had put off until now.

How do I upgrade while preserving baseband on Windows? I do not see any indication that any of these methods will hacktivate the iphone, so do not want any shocks done by assumptions.

Click to expand...

The only way to do it is by downloading a custom ipsw for your device that has been made by an iPhone user using PwnageTool.

If you don't want to go through with the downloading a custom ipsw route, you can update to 4.0/4.0.1/4.0.2 and still be able to unlock. But you will need to edit your host files or using TinyUmbrella to upgrade. And there is no hactivating 4.0-4.0.1 (you'll need the original sim). www.jailbreakme.com (straight from safari on iPhone) will jailbreak after being activated.

The only way to do it is by downloading a custom ipsw for your device that has been made by an iPhone user using PwnageTool.

If you don't want to go through with the downloading a custom ipsw route, you can update to 4.0/4.0.1/4.0.2 and still be able to unlock. But you will need to edit your host files or using TinyUmbrella to upgrade. And there is no hactivating 4.0-4.0.1 (you'll need the original sim). www.jailbreakme.com (straight from safari on iPhone) will jailbreak after being activated.

4.0.2 can be jailbroken with LimeRa1n (which hactivates).

If you desire to go to 4.1/4.2.1 you need a custom ipsw.

Click to expand...

If I obtained a custom ipsw for 4.2.1 and proceed to shift-restore to it, is that the only step? (After which I just reinstall ultrasn0w from cydia)

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.